Letter enclosing air monitoring report, 75 Maiden Lane, Mar 2002

NYC 9/11 Public Portal Document 03/02/2002 16:52 2122691585 MEDIA TECH CENTERS PAGE 02 03/06/2002 0603 212545.0757 AbVA10Ell ENVIR IENT PAGE 02

dvanced Environmental Corp.

February 21, 2002

Mr. Robert Spatz ~j Recovery Physical Therapy 79 Maidtd Lane New York, NY 10038 Lane, New York, NY Rei Air Monitoring, Basement Therapy Room, 79 Maiden

Dear Mr. Spatz: performed limited air monitoring at the above On Feld 12, 2002, Advanced nvfronmentsl Coi'P. respirable dust, and priority pollutant metal location. samples were collected to document the asbestos, tit 79 Maiden Lame, New York, NY. concentrations of the ambient air from the basement therapy room comply with ORSA permissible exposure Please be advised that this information is not intended to following asbestos abatement work. We reference monitoring requirements or requirements for clean air give Information for comparative reasons. the OSHA standards and abatement release Criteria to merely

Asbestos ansmis5iOt► Blectrcm Microscopy (TEM) method One (1) sample was collected and analyzed using the T dispersive X-ray analyels is an analytical according to the EPA AHERA protocol. TEM with energy identified, in this case asbestos. This fiber method that enables a fibers chemical composition to be spec protocol is generally utilized to determine clears air follov►r a "large" abatement project. TEM detected per square millimeter of collection sample analysis detects biter loads (the number of BIitvttvn>rs release criteria of 70 structures per square media sudaoe) whicb, if less than or equal to B'A-AHERA mmeter (s/1Ytaxt2), determine whether or not the area is safe Lot re-occupancy. cellulose ester filter/support pad cassette, The sample was collected on a 0.4-pm pore size, 25 nut mixed used to draw air through the filter media. with a 10 mm electrostatic cowl. High volume air pumps were t sampling to ensure an accurate Flow rates were measured with a calibrated rotarneter, before and af volumetric reading. The sample results can be found in The ThM sample was collected from basement therapy root. sample volume, structure counts, Appendix A. Listed is the sample identification number, area analyzed, Appendix A shows, no asbestos analytical sensitivity, and the concentration of asbestos. As a review of stn etu res were detected on any samples collected.

B,eapirable lrinst (Particulates (Insuinable} Not Otherwise Classified IP40Cs1 the National Institute of One Respirable Dust air sample was collected and analyzed according to was collected on a 5-j.cm pore' size Occupational Safety and Idealth (NIOSH) 500/600 method. The sample personal air pump low flow volume pre-weighted PVC membrane filter using a 37 millimeter cassette. A Mini Buck calibrator ,was used to draw air through the filter media. Flow rates were measured with a accurate volumetric reading. model M.30, before and after sampling to ensure an

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